From December 13, 2026, most non-wholemeal wheat flour sold in the UK must contain added folic acid, a synthetic form of vitamin B9. The change will affect flour used in everyday foods, including bread, pasta, cakes and biscuits, as the government seeks to prevent serious birth defects.
Why the UK Is Changing Its Flour Rules
According to The Mirror, the new legislation requires millers to add 250 micrograms of folic acid per 100 grams of non-wholemeal wheat flour. The requirement covers most white and brown wheat flour, including imported flour, but excludes wholemeal flour, gluten-free products and certain small-scale millers.
The measure targets neural tube defects, including spina bifida, which develop when a baby’s brain or spinal cord fails to form properly. These conditions can arise within the first four weeks of pregnancy, often before a woman knows she is pregnant.
The government estimates that fortification could prevent approximately 200 cases each year. It also projects around £20 million in NHS savings and more than £90 million in wider economic benefits over ten years.
The policy was first announced under Boris Johnson’s government in 2021. Legislation followed in November 2024, allowing manufacturers a two-year transition before mandatory compliance begins.
Why Folic Acid Is Being Added to Everyday Foods
Folic acid is the manufactured form of vitamin B9, while folate occurs naturally in foods such as leafy vegetables, beans and citrus fruits.
Manufacturers favor folic acid because it remains more stable during food processing and storage, making it suitable for flour fortification.
The UK already requires non-wholemeal wheat flour to contain calcium carbonate, iron, thiamin and niacin. Adding folic acid extends this longstanding fortification policy.
More than 60 countries have introduced similar measures, including the United States, Canada and Australia. Some UK supermarket products already contain folic acid because manufacturers began adopting the new requirements during the transition period.
Why Fortified Bread Will Not Replace Pregnancy Supplements
Despite the expected benefits, health professionals stress that fortified flour alone cannot provide the recommended protection during pregnancy.
Dr Clare Tower, an NHS Consultant in Obstetrics and Fetal and Maternal Medicine, explains:
“The flour rules will help many women but may miss those trying hardest to eat well. I am not suggesting swapping wholemeal bread for white bread. My message is that fortified flour is a safety net for the population and not a replacement for the daily folic acid supplement.
“I urge anyone planning a baby to keep taking folic acid tablets. The reason for this is that the amount of folic acid added is modest, at 250 micrograms per 100g of flour compared to the 400 micrograms women are advised to take every day. People assume that if they’re eating well, they’re covered.
“But the new rules only apply to some flours, the amount is modest, and it won’t get most of us to the level we need before pregnancy. The flour will help, but it won’t replace the folic acid tablet.”
The NHS continues to recommend 400 micrograms of folic acid daily for women planning pregnancy and throughout the first 12 weeks.
What the Change Means for Shoppers
UK health authorities consider the fortification level safe for most consumers. High folic acid intake can complicate the diagnosis of vitamin B12 deficiency, particularly among older adults, although this concern primarily involves larger supplemental doses.
Consumers who prefer to avoid added folic acid can choose exempt products, including 100% wholemeal flour and gluten-free alternatives.
From December 13, the mandatory addition will apply to most non-wholemeal wheat flour placed on the UK market, whether produced domestically or imported.
